lambda example

daveagp · daveagp · commit 8378d6f33526 · 2014-04-16T11:55:05.000-04:00
diff --git a/example-code/LambdaExample.java b/example-code/LambdaExample.java
@@ -1,14 +1,22 @@
+import java.util.function.*;
+import java.util.ArrayList;
+
 public class LambdaExample {
-    public static void main(String[] args) {
-        java.util.function.Function<Integer, Integer> square =
-            x -> {
-            int result = 0;
-            for (int i=0;
-                 i<x;
-                 i++)
-                result++;
-            return result;
-        };
-        System.out.println(square.apply(5));
-    }
+   
+   static Function<Integer, Integer> inc(int x) {
+      return y -> x+y;
+   }
+   
+   static Function<Integer, Integer> mul(int x) {
+      return y -> x*y;
+   }
+
+   public static void main(String[] args) {
+      // bad style, generic erasure to get array
+      Function[] fs = {inc(5), inc(10), mul(7), mul(2)};
+      
+      for (Function f : fs) 
+         System.out.println(
+            ((Function<Integer, Integer>)f).apply(100));
+   }
 }
